Maximum call stack size exceeded​​ error for dataUri validation

[JSteunou]

Support plan

• which support plan is this issue covered by? (e.g. Community, Core, Plus, or Enterprise):
• is this issue currently blocking your project? (yes/no):
• is this issue affecting a production system? (yes/no):

Context

• node version: v12
• module version with issue: v15.1.1
• last module version without issue:
• environment (e.g. node, browser, native): node
• used with (e.g. hapi application, another framework, standalone, ...): standalone
• any other relevant information:

What are you trying to achieve or the steps to reproduce?

simple Joi.string().dataUri() with a big string (over than 6Mb)

What was the result you got?

RangeError, maximum call stack size exceeded

What result did you expect?

Joi validation

Same issue than #1700 but with dataUri :)

[JSteunou]

I think this could lead to a Regular Expression Denial of Service attack

[JSteunou]

Tested the same fix that #1700 and it worked but I'm not a regexp expert so I would be more confident if someone else take a look at it

[JSteunou]

Thank you @hueniverse